Rmilter is used to integrate rspamd with any milter-compatible MTA, for
example postfix or sendmail. Features include:

- ClamAV scanning (via unix or tcp socket).
- Rspamd scanning
- Greylisting and rate-limiting with redis upstream
- Auto-whitelisting (internal and via redis upstream)
- Replies check (whitelisting replies to sent messages)
- Passing messages and/or their headers to beanstalk servers
